Dental cavities. Holes in the two outer layers of a tooth call
ed the enamel and the dentin. The enamel is the outermost white hard surface and
the dentin is the yellow layer just beneath enamel. Both layers serve to protect
the inner living tooth tissue called the pulp, where blood vessels and nerves reside.
Small cavities may not cause pain, and may be unnoticed by the patient. Larger cavities
can collect food, and the inner pulp of the affected tooth can become irritated
by bacterial toxins, foods that are cold, hot, sour, or sweet - causing toothache.
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